3921231385 has 32 divisors (see below), whose sum is σ = 4986077184. Its totient is φ = 2955960000.

The previous prime is 3921231319. The next prime is 3921231397. The reversal of 3921231385 is 5831321293.

It is not a de Polignac number, because 3921231385 - 2⁷ = 3921231257 is a prime.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1535860 + ... + 1538410.

It is an arithmetic number, because the mean of its divisors is an integer number (155814912).

Almost surely, 2^3921231385 is an apocalyptic number.

It is an amenable number.

3921231385 is a deficient number, since it is larger than the sum of its proper divisors (1064845799).

3921231385 is a wasteful number, since it uses less digits than its factorization.

3921231385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2845.

The product of its digits is 38880, while the sum is 37.

The square root of 3921231385 is about 62619.7363855837. The cubic root of 3921231385 is about 1576.9121159015.

The spelling of 3921231385 in words is "three billion, nine hundred twenty-one million, two hundred thirty-one thousand, three hundred eighty-five".